Cause
Faulty manual shift switch
The switch or paddles requesting manual gear changes. It fails selectively — up works and down does not — because each direction is its own contact, and since the gearbox drives perfectly in automatic the fault reads as a software oddity rather than a switch.
Typically an easy fix. Often worth checking before paying anyone to look.
Codes this can cause (12)
Codes where this is a likely explanation first, rather than merely a possible one.
- P0815 Upshift Switch Circuit Likely for this code Low
- P0816 Downshift Switch Circuit Likely for this code Low
- P0819 Up and Down Shift Switch to Transmission Range Correlation Likely for this code Moderate
- P0826 Up and Down Shift Switch Circuit Likely for this code Low
- P0827 Up and Down Shift Switch Circuit Low Likely for this code Low
- P085F Up and Down Shift Switch Circuit Range/Performance Likely for this code Moderate
- P0950 Auto Shift Manual Control Circuit Likely for this code Low
- P0951 Auto Shift Manual Control Circuit Range/Performance Likely for this code Low
- P0952 Auto Shift Manual Control Circuit Low Likely for this code Low
- P0954 Auto Shift Manual Control Circuit Intermittent Likely for this code Low
- P0828 Up and Down Shift Switch Circuit High Low
- P0953 Auto Shift Manual Control Circuit High Low
Information, not instruction
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